It's important to know which extensions you have installed to make sure you are using each one to its fullest extent. You may have functionality available to you that you are not aware of. Also, if the list is very long, you may want to look for extensions that handle the functionality of more than one extension. Extension conflicts do happen and managing your portfolio of install extensions will help keep your Magento site lean and mean! Your developer can easily find these by looking in the appropriate folder on your server and if they are maintaining your web store, they should know what each one does.
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